Steps to Reproduce:
1. Play Runeshell Crab.
2. During the opponent's turn, have the opponent debuff Runeshell Crab's power by at least 1 (ex.: play and activate Ghost Blades).
3. Repeat step 2.

Actual Result:
Runeshell Crab's power remains at 2.

Expected result:
Runeshell Crab's and Runeshell King's buffs during the opponent's turn can be reduced by debuffs. When their buffs are not active (on the player's turn), their power is reduced to 0; when their buffs are active again (on the opponent's subsequent turns), their buffs are regained.